#include <stdio.h>
#include <string.h>

int main()
{
    char*s = "HF240401_pxl_1";

    char*p = strstr(s,"pxl");
    if(p == NULL)
    {
        printf("未找到\n");
    }
    else
    {
        printf("p = %s\n", p);
    }
}